31020201 has 24 divisors (see below), whose sum is σ = 45805760. Its totient is φ = 20225376.

The previous prime is 31020191. The next prime is 31020221. The reversal of 31020201 is 10202013.

It is a happy number.

It is not a de Polignac number, because 31020201 - 2⁶ = 31020137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31020221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100890 + ... + 101196.

Almost surely, 2^31020201 is an apocalyptic number.

It is an amenable number.

31020201 is a deficient number, since it is larger than the sum of its proper divisors (14785559).

31020201 is a wasteful number, since it uses less digits than its factorization.

31020201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525 (or 522 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 31020201 is about 5569.5781707415. The cubic root of 31020201 is about 314.2062859395.

Adding to 31020201 its reverse (10202013), we get a palindrome (41222214).

It can be divided in two parts, 3 and 1020201, that multiplied together give a palindrome (3060603).

The spelling of 31020201 in words is "thirty-one million, twenty thousand, two hundred one".